From 86531adc6945e2de1e16da3158d6e99df558ca5b Mon Sep 17 00:00:00 2001
From: Andrey Kunchev <donandren@gmail.com>
Date: Mon, 3 Feb 2020 10:31:34 +0200
Subject: [PATCH] fix #3500 crash after close any fullscreen window  on mac

---
 native/Avalonia.Native/src/OSX/window.mm | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/native/Avalonia.Native/src/OSX/window.mm b/native/Avalonia.Native/src/OSX/window.mm
index 3acc5e365b..e39a061e99 100644
--- a/native/Avalonia.Native/src/OSX/window.mm
+++ b/native/Avalonia.Native/src/OSX/window.mm
@@ -805,7 +805,12 @@ NSArray* AllLoopModes = [NSArray arrayWithObjects: NSDefaultRunLoopMode, NSEvent
         [self removeTrackingArea:_area];
         _area = nullptr;
     }
-    
+
+    if (_parent == nullptr)
+    {
+        return;
+    }
+
     NSRect rect = NSZeroRect;
     rect.size = newSize;